rtpengine: doc typos

(cherry picked from commit b86fa175e92be4a2ab36f198ebc47d8f9b7c9e2a)
Adapted for 5.2

src/modules/rtpengine/doc/rtpengine_admin.xml

@@ -480,7 +480,7 @@ modparam("rtpengine", "rtp_inst_pvar", "$avp(RTP_INSTANCE)")
 		<title>Set <varname>hash_table_size</varname> parameter</title>
 <programlisting format="linespecific">
 ...
-modparam("rtpengine", "hash_table_size", "123")
+modparam("rtpengine", "hash_table_size", 123)
 ...
 </programlisting>
 		</example>
@@ -507,7 +507,7 @@ modparam("rtpengine", "hash_table_size", "123")
 		<title>Set <varname>hash_table_tout</varname> parameter</title>
 <programlisting format="linespecific">
 ...
-modparam("rtpengine", "hash_table_tout", "300")
+modparam("rtpengine", "hash_table_tout", 300)
 ...
 </programlisting>
                 </example>
@@ -1980,7 +1980,7 @@ modparam("rtpengine", "mos_average_samples_B_pv", "$avp(mos_average_samples_B)")
 		<title>Set <varname>control_cmd_tos</varname> parameter</title>
 <programlisting format="linespecific">
 ...
-modparam("rtpengine", "control_cmd_tos", "144")
+modparam("rtpengine", "control_cmd_tos", 144)
 ...
 </programlisting>
 		</example>